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MINOR: ist: Add a case insensitive istmatch function

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Add a helper function that checks if a string starts with another string
while ignoring case.
This commit is contained in:
Remi Tricot-Le Breton 2020-10-28 11:35:14 +01:00 committed by William Lallemand
parent a6476114ec
commit bb4582cf71
1 changed files with 20 additions and 0 deletions
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20
include/import/ist.h
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@ -315,6 +315,26 @@ static inline int istmatch(const struct ist ist1, const struct ist ist2)
return 1; return 1;
} }
/* returns non-zero if <ist1> starts like <ist2>, ignoring the case (empty strings do match) */
static inline int istmatchi(const struct ist ist1, const struct ist ist2)
{
struct ist l = ist1;
struct ist r = ist2;
if (l.len < r.len)
return 0;
while (r.len--) {
if (*l.ptr != *r.ptr &&
ist_lc[(unsigned char)*l.ptr] != ist_lc[(unsigned char)*r.ptr])
return 0;
l.ptr++;
r.ptr++;
}
return 1;
}
/* returns non-zero if <ist1> starts like <ist2> on the first <count> /* returns non-zero if <ist1> starts like <ist2> on the first <count>
* characters (empty strings do match). * characters (empty strings do match).
*/ */